4mm micro-diameter uniform ACU-Carbon fiber construction Pre-installed 4mm Microlite nocks Straightness: .003" Weight: 400 spine 7.4 gpi | 340 spine 8.3 gpi |300 spine 9.3 gpi | 250 spine 9.8 gpi Includes 8/32 Easton 4MM Half-Outs (Aluminum) #2070887 for optimum FOC Weight: 50 grain Precise two-point interface with shaft increases strength 1/16" +/- shaft engagement under half out Spine specific construction allows for the tightest tolerance between components Non-reflective black anodized finish Adds 1" to carbon length 400 spine use #1 | 340 spine use #2 | 300 spine use #4 | 250 spine use #4 Compatible with Easton 4MM Titanium Half-Out #2070807 Weight: 55 grains Uses 5/16" diameter field point